3.08 ZhaoZhao_Crown lengthening Flashcards
What study compared epithelium length in periodontitis vs. healthy patients?
Novak
What is the average biologic width? (Gargiulo)
Gargiulo ‘61
2.04 mm
Junctional epithelium: 0.97 mm
Connective tissue: 1.07mm
What are the classifications for vertical maxillary excess?
Silberberg ‘09
Degree I: Gingival display 2-4 mm.
Treatments:
* Ortho intrusion only
* Ortho + perio
* Perio + resto
Degree II: 4-8mm
Treatments:
* Perio + resto
* Orthognathic surgery
Degree III: 8+ mm
Treatments:
* Orthognathic with or without perio + resto
What are the different esthetic classifications of the lip?
Tjan ‘12
High: All the teeth, and more than 2mm of gingiva, are exposed = 11%
Average: 75 - 100% length of teeth exposed = 69%
Low: < 75% length of teeth exposed = 20%
What are the ideal ratios of the teeth?
Chu ‘07
Mx central: 80% (width:height)
Mx lateral: 70% (width:height)
Mx Canine: 75% (width:height)
Average measurements:
Mx central: 8.5mm wide, 10.5 mm high
Mx lateral: 6.5mm wide, 9 mm high
Mx Canine: 7.5 mm wide, 10mm high
Chu ‘08
Ideal ratios are calculated from the Mn central incisor (since it’s the most constant)
Mn central: x
Mn lateral: x+1/2
Mn canine: x+1
Mx central: X+3 = Y
Mx lateral: Y-2
Mx canine: Y-1
Chu ‘07 and ‘08
Can also use the “T-bar” proportion gauge tip.
78% width/length ratio in designing
What are the ideal locations of the gingival zeniths?
Chu ‘09
The maxillary central zenith: 1mm distal from center.
Mx lateral: 0.4mm distal from center
Mx canine: 0mm (at the center)
What are the classifications for altered passive eruption?
Coslet ‘77
1A: wide KTW, normal bone (1.5mm from CEJ)
1B: wide KTW, high bone (at CEJ)
2A: narrow KTW, normal bone (1.5mm from CEJ)
2B: narrow KTW, high bone (at CEJ)
Treatments:
1A: gingivectomy
1B: Gingivectomy + osseous
2A: APF
2B: APF + osseous
Zangrando ‘17
Altered passive eruption only: results in excess gum height
Altered passive eruption + altered active eruption: Excessive gum height + excess bone height
